I have designed a flyback driver with the Linkswitch-PH very similar to rdr195. It fails Class 2 certification because the secondary output peaks at just over 60V when the load is opened. I have tried adjusting the OVP zener with different voltages, and changing the time constant of several of the filters, but the open voltage still peaks at just over 60V before OVP kicks in and auto-restart occurs. What else can be done to ensure the open peak voltage stays under 60V? It is designed for 40V nominal Vout @ 350mA.